89 lines
2.4 KiB
Rust
89 lines
2.4 KiB
Rust
/// Helper functions, especially to reproduce C std/posix functions
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use nix::errno::*;
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use nix::sys::termios;
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use nix::sys::termios::{
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ControlFlags, InputFlags, LocalFlags, OutputFlags, SpecialCharacterIndices, Termios,
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};
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use nix::Error as NixError;
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use std::io::Error;
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use std::os::unix::io::RawFd;
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use std::process::exit;
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// Redefine the posix constants for rust land
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/// The value of the raw file descriptor for STDIN
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pub const STDIN_FILENO: i32 = 0;
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// pub const STDOUT_FILENO: i32 = 1;
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// pub const STDERR_FILENO: i32 = 2;
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/// Convert Ctrl+letter chords to their
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/// ASCII table equivalents
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#[inline]
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pub fn ctrl_key(c: char) -> char {
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let key = c as u8;
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if !c.is_ascii() {
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panic!("CTRL_KEY only accepts ASCII characters");
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}
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// Intentionally "overflow" u8 to wrap around to the
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// beginning of the ASCII table. Ctrl+a is 1, Ctrl+b is 2, etc.
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(key & 0x1f) as char
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}
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pub fn die(code: &Errno, msg: &str) -> ! {
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eprintln!("{:?} ({})", code, msg);
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exit(1)
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}
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/// Get a `Termios` struct, for getting/setting terminal flags
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pub fn get_termios(fd: RawFd) -> Termios {
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termios::tcgetattr(fd).unwrap()
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}
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/// Put terminal into raw mode so there is full control of terminal output
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pub fn enable_raw_mode() {
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let mut raw = get_termios(STDIN_FILENO);
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raw.input_flags.remove(
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InputFlags::BRKINT
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| InputFlags::IGNCR
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| InputFlags::IGNBRK
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| InputFlags::ICRNL
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| InputFlags::INLCR
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| InputFlags::INPCK
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| InputFlags::ISTRIP
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| InputFlags::IXON
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| InputFlags::PARMRK,
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);
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raw.output_flags.remove(OutputFlags::OPOST);
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raw.local_flags.remove(
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LocalFlags::ECHO
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| LocalFlags::ECHONL
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| LocalFlags::ICANON
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| LocalFlags::IEXTEN
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| LocalFlags::ISIG,
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);
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raw.control_flags
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.remove(ControlFlags::CSIZE | ControlFlags::PARENB);
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// 8 bit characters
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raw.control_flags |= termios::ControlFlags::CS8;
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raw.control_chars[SpecialCharacterIndices::VMIN as usize] = 0;
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raw.control_chars[SpecialCharacterIndices::VTIME as usize] = 1;
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// Raw mode or bust!
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termios::tcsetattr(STDIN_FILENO, termios::SetArg::TCSAFLUSH, &raw).unwrap();
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}
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/// Restore terminal to "cooked"/canonical mode
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pub fn disable_raw_mode(original: &Termios) {
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termios::tcsetattr(STDIN_FILENO, termios::SetArg::TCSAFLUSH, original).unwrap();
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}
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